Table 3.

Statistics of the features across the 2 smoker groups. P values are calculated by the Mann-Whitney U test.

Type and feature (range)			Light smokers, mean (SD)		Moderate and heavy smokers, mean (SD)		P value
Demographics
	Age (years)	33.7 (9.2)		39.6 (10.3)		.02
	Smoking initiation age (years)	17.5 (4.0)		18.4 (4.2)		.23
	Smoking years	16.2 (9.6)		21.2 (11.4)		.09
	Fagerström Test of Nicotine Dependence (0 to 10)	2.7 (1.9)		4.0 (1.6)		.01
Ecological momentary assessment
	Strength of craving (0 to 4)	2.3 (0.8)		2.6 (0.7)		<.001
	Emotional valence (−4 to 4)	1.2 (1.8)		1.8 (1.8)		<.001
	Emotional arousal (−4 to 4)	−0.2 (1.9)		−1.0 (2.1)		<.001
	Enjoyment of cigarettes (0 to 4)	2.3 (0.7)		2.6 (0.6)		.001
	Difficulty of resisting smoking (0 to 4)	2.3 (0.7)		2.5 (0.7)		.002